Saturday

April 19, 2014

April 19, 2014

Total # Posts: 87

**Chemistry**

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca2 (aq) and 0.0370 M Ag (aq). What will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate?

**calculus**

If the nth partial sum of an is sn=(3n-2)/(n+1) what is an when x>1? and what is the sum of an?

**physics**

A(n) 800 kg drag race car accelerates from rest to 103 km/h in 1.05 s. What average net force is exerted on the car?

**physics**

The instant before a squishy ball of mass meets a horizontal floor and comes to rest in time ?t it has momentum p = p0 (ˆi −ˆj ) .What average force does the floor exert on the ball in order to stop it during this time interval?

**Physics**

At time 9 s, a car with mass 1400 kg is lo- cated at <94m, 0 m, 30m> and has momentum <4500 kg · m/sec, 0 kg · m/sec,−3000 kg · m/sec> . The car’s momentum is not changing. At time 18 s, find the position of the car: ~d = <dx, dy,...

**Physics**

At time 9 s, a car with mass 1400 kg is lo- cated at <94m, 0 m, 30m> and has momentum <4500 kg · m/sec, 0 kg · m/sec,−3000 kg · m/sec> . The car’s momentum is not changing. At time 18 s, find the position of the car: ~d = <dx, dy,...

**calculus**

limit as n approaches infinity for the function ((-1)^n)((5n+7)/(6n+5))

**Physics**

an alpha particle of mass m= 6.6 x 10^-27 kg has a speed of .81c, where the speed of light is c= 3 x 10^8 m/s. The alpha particle collides with a gold nucleus and rebounds with the same speed in the opposite direction. If the collision lasted for t= 4 x 10^-7s, what is the mag...

**physic**

an alpha particle of mass m= 6.6 x 10^-27 kg has a speed of .81c, where the speed of light is c= 3 x 10^8 m/s. The alpha particle collides with a gold nucleus and rebounds with the same speed in the opposite direction. If the collision lasted for t= 4 x 10^-7s, what is the ma...

**physics**

an electron of mass m has a speed of v. at what speed would the ration of the magnitudes of the relativistic and non relativistic momenta be equal to 2?

**Physics **

An electron passes location <0.02m, 0.04m,−0.06m>, and 4 μs later is de- tected at location <0.02 m, 1.84 m,−0.86 m>. Find the average velocity of the elecron: ¯v = <vx, vy, vz> If the electron continues to travel at this av- erage veloc...

**physics**

An electron passes location h0.02m, 0.04m,−0.06mi, and 4 μs later is de- tected at location h0.02 m, 1.84 m,−0.86 mi. Find the average velocity of the elecron: ¯v = <vx, vy, vz> If the electron continues to travel at this av- erage velocity, find wh...

**physics **

A baseball has a mass of about 155 g. What is the magnitude of the momentum of a baseball thrown at a speed of 95 mph?(Note that you need to convert mass to kilograms and miles per hour to meters per second.) Answer in units of kg · m/s

**Physics **

An ice skater skates 16.9 m southwest, then 33.8 m east, and finally 50.7 m in a direction 50.9◦ north of east. Find the magnitude of the displacement re- quired to bring the skater back to her starting point. Answer in units of m

**Chemistry **

The antacid Amphogel contains aluminum hydroxide Al(OH)3. How many milliliters of 6.00M HCl are required to react with 150mL of 1.12M Al(OH)3? Al(OH)3(s) + 3HCl(aq) → AlCl3(aq) + 3H2O(aq) Help please and thanks in advance

**Chemistry **

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 hr and is a pure gamma emitter. Suppose that 200mg were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals? 1- One half ...

**Chemistry **

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 hr and is a pure gamma emitter. Suppose that 200mg were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals? 1- One half ...

**Chemistry **

Technetium-99m is an ideal radioisotope for scanning organs because it has a half-life of 6.0 hr and is a pure gamma emitter. Suppose that 200mg were prepared in the technetium generator this morning. How many milligrams would remain after the following intervals? 1- One half ...

**math**

Joey has a beach ball with a radius of 20 cm. What volume of air will it hold when fully inflated?

**7th grade math Ms. Sue please**

I just took this test, I'm going to help you with problems 13 through 15. 13.C 14.C 15.D I got 100% on this test. Btw... Connections kids aren't really allowed to ask these questions you konw.

**social studies**

which of the following statements is supported by the information in the map? ONE) australia is self-supporting in oil two)Africa trades oil only with south America.three)the soviet Union has trade routes with every major continent. four) all of the major continents have crude...

**math**

A cylindrical gasoline can is 18 inches across and 20 inches tall.which expression represents the approximate volume in cubic inches? (1)(3.14)(9)2(20) 2) (3.14)(9)(202)2 3) (3.14)(18)(20) 4) (3.14(18)2(20) 5) (3.14(36)2(20)

**math**

i need your help please guys thanks

**math**

one angle of a triangle is 90 degrees.if the ratio of the legs is 1:1,what are the measures [in degrees] of the two remaining angles? [1] 30 and 30 [ 2] 30 and 60 [ 3] 45 and 45 [ 4] 60 and 60 [5] 45 and 30

**math**

a large elm tree died after it was struck by lightning.the property owner thinks he can remove it himself,but is concerned that it will fall on his greenhouse.he takes several measurement before attempting to cut it down.at 3 p.m. he measures the shadow of the tree and finds i...

**Advance fuctions**

write and that is equivalent to each of the following expression,using the related acute angle a) sin 13pi/6 b) cos 11pi/8 c) tan 7pi/4

**Advance fuctions**

write and that is equivalent to each of the following expression,using the related acute angle a) sin 13pi/6 b) cos 11pi/8 c) tan 7pi/4

**chemistry**

please could you identify at least 2 limitations each for the coordinate bonding and metallic bonding theories?

**Chemistry**

Calculate the solubility of ZnCO3 in .050 M Zn(NO3)2. Ksp= 3.0*10^-8 solubility= 1.7*10^-4

**algebra**

grandpa has 9 grandchildren. the following ages are 1 15 9 12 18 9 5 14 7. which statement does the data support

**Algerbra 1 substitution method**

X=2 Y=-1 (2,-1)

**Algerbra 1 substitution method**

X=2 Y=-1 (2,-1)

**statistics**

Someone who has never seen a normal die before decides to estimate the mean value of all its faces (μ) by rolling it many times. First, they are told that the standard deviation is σ = 1.7. Then, they roll the die 50 times and get a sample mean of x-bar = 3.7. Finall...

**Physics**

17. A 60.-kilogram student climbs a ladder a vertical distance of 4.0 meters in 8.0 seconds. Approximately how much total work is done against gravity by the student during the climb?

**Chemistry**

Ok, so how then do I figure out the expected moles for N2 at the end of the equation. Is it that because of the 1:1 ratio that the .0073 mol of NaNO2 are the same for the N2 gas?

**Chemistry**

In the lab experiment (Ideal Gas Behaviour) we were told to calculate the Molar voume of N2 gas using the equation - vol N2 @STP/ mol N2 produced. The mol of N2 produced were found using the equation PV=nRT where P = Net pressure of N2 alone = 744.11 (tot pressure - vapour pre...

**Chemistry**

In the Formula... Na+ + NO2- + HSO3NH2 -> HSO4- + H2O + N2 + Na+ which I know has a 1:1 ratio, How do I figure out the Moles of N2 gas expected. Molar volume = 24.627 L/mol Moles of N2 produced = .0067 mol Volume of N2 gas of STP = .165 L Original used .5062g of NaNO2 to pr...

**accounting**

thank u so much

**Algebra-HELP**

Thank you!!

**Algebra-HELP**

well i know the x-intercept is (3,-2) but i can seem to understand y intercept. I thought it would be (0,0) but it was wrong

**Algebra-HELP**

Find the x and y intercepts of f(x)=x^2-x-6.

**physics**

h=100m t=200/9.8= 20.408 sec.

**math**

Reasoning DOES (4+5)+2=9+2?Explanin.

**math**

Reasoning DOES (4+5)+2=9+2?Explanin.

**chemistry**

the answer is 26.301 mL because 26.301 x 0.99704 = 26.223

**geometry**

144 beacuse 12 times 12 is 144 asholes

**MATH PLEASE HELP!!!!!**

Guess and check a caterpillar has twice as many legs as a spider. Together,they have 24 legs.how many legs does the spider have.? How many legs does the caterpillar have?

**physics**

what is relationship between mass of rotating object and its period

**Life orientation**

Two institution/community that are involved in supporting or giving redress to teenage pregnancy

**English**

can someone overlook my answers to help with the questions that are wrong at let me know which ones are right. Bold = my answers I chose (right) Wind can create alterations in the surface layers of rock. Wind Is one cause of erosion. Which of these sentences combines the sente...

**Chemistry**

What is the concentration of CrO22 4 in 0.0040 M Ba(NO3)2 saturated with BaCrO4. Including the activity coefficients in the expression? The ksp of BaCrO4 is 1.17 x10^-10 [CrO4 2-]= ? M I want to understand the problem not just the answer please.

**French**

Guillaume voyage avec ______ soeur et _______ parents. i have to use " SON , SA, OR SES " as appropriate.

**MATH**

IF THERE ARE 24 GIRLS IN THE CLASS HOW MANY BOYS ARE THERE IN THE CLASS Y=3/8X

**Math**

answer to travis has designed a rectangle with an area of 59 square units. his rectangle is the smallest rectangle with whole number side lengths. what are the length and width of the rectangle, explain your reasoning. what is the perimeter of the rectangle? explain your reaso...

**Statistics**

Marks: --/20 What percentage of the general US population have bachelor's degrees? The Statistical Abstract of the United States (120th edition), gives the percentage of bachelor's degrees by state. For convenience, the data are sorted in increasing order. 17, 18, 18, ...

**chemistry**

What is the concentration of a HNO3 solution if 10.0 mL of the solution is neutralized by 3.6 mL of a 0.20 M NaOH solution?

**physics help**

A uniform plank of length 5.1 m and weight 235 N rests horizontally on two supports, with 1.1 m of the plank hanging over the right support (see the drawing). To what distance x can a person who weighs 458 N walk on the overhanging part of the plank before it just begins to ti...

**math**

can you write 4+4+3=11 in a multiplication sentence?explain.

**math**

can you write 4+4+3=11 in a multiplication sentence?

**3rd grade math**

kelly collects dime quaters and nickels and pennies he took 40 cents from his collection he counted the coins and found out he had twice as many nickels as dimes what coins could kelly have?

**Physics**

A particle's initial velocity is −24.0 m/s. Its final velocity, 3.10 seconds later, is −14.0 m/s. What was its average acceleration?

**geometry**

G lies on the perpendicular bisector of segment AB, AG = x2 + 4x, and BG = x + 18. Find AG

**math**

The wheel on a child's bicycle is 48 cm in diameter. To test the strength of the tire, William lifts the back wheel 1 m from the ground and spins it at 36 turns/min. He attached a blue sticker to the bottom of the tire beforehand. Assuming that William spins the tire at a ...

**help**

What is the percentage of words in an english dictionary that have latin or greek as their source? A} 50% B} 60% C} 70% D} 80% .i choose a.

**college algebra**

please solve by method of substitution 0.3x-0.4y-0.33=0 0.1x + 0.2y -.21=0 please give all steps to solve.I think I understand the basic concept but this is little more complicated for me. Thanks in advance

**Math**

Im sorry but i do not see how to solve. I just figured out that it is 53 cappuccinos and 23 expressos, but i can not make an equation that shows how I got those two numbers.

**Math**

Suppose the central Park Coffee Shop sells a cup of expresso for 2.00 and a cup of cappuccino for 2.50. On Friday Destiny sold 30 more cups of cappuccino than expresso for a total of 178.50, worth of expresso and cappuccino. How many cups of each were sold? I am learion to lea...

**2nd grade math**

At what time is eh sum of the digits on a digital clocck the greatest? The answer is 12:59 right?

**algebra II**

How do you know if a quadratic equation will have one, two, or no solutions? How do you find a quadratic equation if you are only given the solution? Is it possible to have different quadratic equations with the same solution? Explain. Provide your classmate’s with one or...

**Human resources**

Analyze how emotional and physical aspects of a person’s life can influence the employee’s effectiveness in the work environment.

**human resources**

My chosen career is registered nursing for this one assignment. I need an idea of how to start this assignment.

**human resources**

Needs assessment: What types of issues might indicate a need for training? From what sources would these issues be identified? If you were a training manager, how would you prioritize training needs from these sources? a. A supervisor requests training on the specialized techn...

**AlgebraII**

Why is it important to simplify radical expressions before adding or subtracting? How is adding radical expressions similar to adding polynomial expressions? How is it different? Provide a radical expression for your classmates to simplify

**AlgebraII**

Why is it important to simplify radical expressions before adding or subtracting? How is adding radical expressions similar to adding polynomial expressions? How is it different? Provide a radical expression for your classmates to simplify.

**5th grade math**

can you help me in math? please

**Math**

On the first day of school everyone wants to shake hands. How many handshakes in all? Hint: There are 30 kids

**Algebra 2**

how do you graph the function? f(x)=2(x+2)^2(x+4)^2

**explantaation**

how do birds fly? do u know where to find diagrams of how birds fly? http://www.fi.edu/wright/again/wings.avkids.com/wings.avkids.com/Book/Animals/intermediate/birds-01.html

**language arts**

fly rocket

**respiration/releasing energy**

Does respiration release more energy from 1 gram of fat than from 2 grams of glucose?

**please help-plasma membrane**

I got this question marked wrong on a paper. Unfortunately, my prof didn't explain. _________________ subtances can pass through the plasma membrane. I put "nonpolar". What is wrong with this and does anyone know the correct solution/answer? Thanks all. http://ww...

**tight junctions**

prevent the contents of the intestine from mixing with bodily fluid on the other side of the epithelium? The statement you made could be true...I'm not exactly sure what you were trying to ask, though... sorry, was asking if tight junctions prevent the contents of the inte...

**question on microscope**

"In order, list the lenses in the light path between a specimen viewed with the compound light microscope and its image on the retina of the eye." My son got this question and I cannot make sense of it. Growing up, we didn't have microscopes to use in school.

**Math**

How do you rename as a fraction and decimal 55 5/9% You should know that 5/9 is 5 repeating, so the decimal is 55.5%(with a bar over the decimal part). 5/9 is the fraction

**economics**

cattle rancher (A) owns a property next to an apple farm (B) cattle sometimes tent to roam into B's land and damage the trees. The rancher can choose the size of the herd. revenue form cattle is $6 per head. The following schedle lists A's marginal prodction cost(MPC) ...

**sociology**

Thought I would add a little piece also. I too accidentally ran across this site and am taking the ETH125 class. It is now April 2009.. Good luck to you all!! Like many of you were; I also am a little confused at this point!! :-) Pretty funny we all ended up on this page! Ill ...

**sociology**

Thought I would add a little piece also. I too accidentally ran across this site and am taking the ETH125 class. It is now April 2009.. Good luck to you all!! Like many of you were; I also am a little confused at this point!! :-) Pretty funny we all ended up on this page! Ill ...

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